I’m trying to Rigify my model. It shows me this error message whenever I try to rigify it. Not sure what to do, Not sure what it means either.
I think it’s a problem that happens when you have added or modified bones?
Click on the message and you’ll see the full message. Check it out. 
It’s wanting to create the UI buttons to show and hide the rig controls.
If you’ve created a metarig by hand, or not upgraded an older version metarig, then the bone collections won’t have been assigned to any UI elements.
Use the ‘UI Layout’ section in the Armature properties to define the buttons, and assign bone collections to them. You only need to have one to get it to generate the rig.
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